Tape on vaccum hose hole

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My foster mom was wondering if anybody had this happened; she vaccums alot for fleas, yesterday she put a piece of tape over the vaccum hose hole after she finished b/c she heard to do that so the fleas wouldn't get out before she changed the bag.
Left it overnight and today when she went to vacumm again of course took tape out, according to the lady that told her she would have seen fleas stuck to the tape but no, there was nothing_ok there was a speck of dirt but who knows what it really was, wasn't a flea_
we know there are fleas b/c we're treated for it. Would it be she vaccumed eggs which are microscopic and don't move?